#include<stdio.h>
#include<assert.h>
size_t my_strlen(const char* str)
{
	assert(str);
	char*p = str;
	while (*p != '\0')
	{
		p++;
	}
	return p - str;
}
int main()
{
	char* arr = "Hello World";
	printf("%zu",my_strlen(arr));
	return 0;
}